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dca5612f8e
Add a set of APIs to perf_buffer manage to allow applications to integrate
perf buffer polling into existing epoll-based infrastructure. One example is
applications using libevent already and wanting to plug perf_buffer polling,
instead of relying on perf_buffer__poll() and waste an extra thread to do it.
But perf_buffer is still extremely useful to set up and consume perf buffer
rings even for such use cases.
So to accomodate such new use cases, add three new APIs:
- perf_buffer__buffer_cnt() returns number of per-CPU buffers maintained by
given instance of perf_buffer manager;
- perf_buffer__buffer_fd() returns FD of perf_event corresponding to
a specified per-CPU buffer; this FD is then polled independently;
- perf_buffer__consume_buffer() consumes data from single per-CPU buffer,
identified by its slot index.
To support a simpler, but less efficient, way to integrate perf_buffer into
external polling logic, also expose underlying epoll FD through
perf_buffer__epoll_fd() API. It will need to be followed by
perf_buffer__poll(), wasting extra syscall, or perf_buffer__consume(), wasting
CPU to iterate buffers with no data. But could be simpler and more convenient
for some cases.
These APIs allow for great flexiblity, but do not sacrifice general usability
of perf_buffer.
Also exercise and check new APIs in perf_buffer selftest.
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Alan Maguire <alan.maguire@oracle.com>
Link: https://lore.kernel.org/bpf/20200821165927.849538-1-andriin@fb.com
310 lines
6.7 KiB
Plaintext
310 lines
6.7 KiB
Plaintext
LIBBPF_0.0.1 {
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global:
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bpf_btf_get_fd_by_id;
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bpf_create_map;
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bpf_create_map_in_map;
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bpf_create_map_in_map_node;
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bpf_create_map_name;
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bpf_create_map_node;
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bpf_create_map_xattr;
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bpf_load_btf;
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bpf_load_program;
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bpf_load_program_xattr;
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bpf_map__btf_key_type_id;
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bpf_map__btf_value_type_id;
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bpf_map__def;
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bpf_map__fd;
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bpf_map__is_offload_neutral;
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bpf_map__name;
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bpf_map__next;
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bpf_map__pin;
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bpf_map__prev;
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bpf_map__priv;
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bpf_map__reuse_fd;
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bpf_map__set_ifindex;
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bpf_map__set_inner_map_fd;
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bpf_map__set_priv;
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bpf_map__unpin;
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bpf_map_delete_elem;
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bpf_map_get_fd_by_id;
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bpf_map_get_next_id;
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bpf_map_get_next_key;
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bpf_map_lookup_and_delete_elem;
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bpf_map_lookup_elem;
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bpf_map_update_elem;
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bpf_obj_get;
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bpf_obj_get_info_by_fd;
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bpf_obj_pin;
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bpf_object__btf_fd;
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bpf_object__close;
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bpf_object__find_map_by_name;
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bpf_object__find_map_by_offset;
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bpf_object__find_program_by_title;
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bpf_object__kversion;
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bpf_object__load;
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bpf_object__name;
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bpf_object__next;
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bpf_object__open;
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bpf_object__open_buffer;
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bpf_object__open_xattr;
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bpf_object__pin;
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bpf_object__pin_maps;
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bpf_object__pin_programs;
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bpf_object__priv;
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bpf_object__set_priv;
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bpf_object__unload;
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bpf_object__unpin_maps;
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bpf_object__unpin_programs;
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bpf_perf_event_read_simple;
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bpf_prog_attach;
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bpf_prog_detach;
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bpf_prog_detach2;
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bpf_prog_get_fd_by_id;
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bpf_prog_get_next_id;
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bpf_prog_load;
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bpf_prog_load_xattr;
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bpf_prog_query;
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bpf_prog_test_run;
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bpf_prog_test_run_xattr;
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bpf_program__fd;
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bpf_program__is_kprobe;
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bpf_program__is_perf_event;
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bpf_program__is_raw_tracepoint;
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bpf_program__is_sched_act;
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bpf_program__is_sched_cls;
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bpf_program__is_socket_filter;
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bpf_program__is_tracepoint;
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bpf_program__is_xdp;
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bpf_program__load;
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bpf_program__next;
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bpf_program__nth_fd;
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bpf_program__pin;
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bpf_program__pin_instance;
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bpf_program__prev;
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bpf_program__priv;
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bpf_program__set_expected_attach_type;
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bpf_program__set_ifindex;
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bpf_program__set_kprobe;
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bpf_program__set_perf_event;
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bpf_program__set_prep;
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bpf_program__set_priv;
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bpf_program__set_raw_tracepoint;
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bpf_program__set_sched_act;
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bpf_program__set_sched_cls;
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bpf_program__set_socket_filter;
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bpf_program__set_tracepoint;
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bpf_program__set_type;
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bpf_program__set_xdp;
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bpf_program__title;
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bpf_program__unload;
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bpf_program__unpin;
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bpf_program__unpin_instance;
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bpf_prog_linfo__free;
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bpf_prog_linfo__new;
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bpf_prog_linfo__lfind_addr_func;
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bpf_prog_linfo__lfind;
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bpf_raw_tracepoint_open;
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bpf_set_link_xdp_fd;
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bpf_task_fd_query;
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bpf_verify_program;
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btf__fd;
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btf__find_by_name;
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btf__free;
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btf__get_from_id;
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btf__name_by_offset;
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btf__new;
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btf__resolve_size;
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btf__resolve_type;
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btf__type_by_id;
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libbpf_attach_type_by_name;
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libbpf_get_error;
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libbpf_prog_type_by_name;
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libbpf_set_print;
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libbpf_strerror;
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local:
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*;
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};
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LIBBPF_0.0.2 {
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global:
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bpf_probe_helper;
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bpf_probe_map_type;
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bpf_probe_prog_type;
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bpf_map__resize;
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bpf_map_lookup_elem_flags;
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bpf_object__btf;
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bpf_object__find_map_fd_by_name;
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bpf_get_link_xdp_id;
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btf__dedup;
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btf__get_map_kv_tids;
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btf__get_nr_types;
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btf__get_raw_data;
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btf__load;
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btf_ext__free;
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btf_ext__func_info_rec_size;
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btf_ext__get_raw_data;
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btf_ext__line_info_rec_size;
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btf_ext__new;
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btf_ext__reloc_func_info;
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btf_ext__reloc_line_info;
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xsk_umem__create;
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xsk_socket__create;
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xsk_umem__delete;
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xsk_socket__delete;
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xsk_umem__fd;
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xsk_socket__fd;
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bpf_program__get_prog_info_linear;
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bpf_program__bpil_addr_to_offs;
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bpf_program__bpil_offs_to_addr;
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} LIBBPF_0.0.1;
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LIBBPF_0.0.3 {
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global:
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bpf_map__is_internal;
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bpf_map_freeze;
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btf__finalize_data;
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} LIBBPF_0.0.2;
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LIBBPF_0.0.4 {
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global:
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bpf_link__destroy;
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bpf_object__load_xattr;
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bpf_program__attach_kprobe;
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bpf_program__attach_perf_event;
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bpf_program__attach_raw_tracepoint;
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bpf_program__attach_tracepoint;
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bpf_program__attach_uprobe;
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btf_dump__dump_type;
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btf_dump__free;
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btf_dump__new;
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btf__parse_elf;
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libbpf_num_possible_cpus;
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perf_buffer__free;
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perf_buffer__new;
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perf_buffer__new_raw;
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perf_buffer__poll;
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xsk_umem__create;
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} LIBBPF_0.0.3;
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LIBBPF_0.0.5 {
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global:
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bpf_btf_get_next_id;
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} LIBBPF_0.0.4;
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LIBBPF_0.0.6 {
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global:
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bpf_get_link_xdp_info;
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bpf_map__get_pin_path;
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bpf_map__is_pinned;
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bpf_map__set_pin_path;
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bpf_object__open_file;
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bpf_object__open_mem;
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bpf_program__attach_trace;
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bpf_program__get_expected_attach_type;
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bpf_program__get_type;
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bpf_program__is_tracing;
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bpf_program__set_tracing;
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bpf_program__size;
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btf__find_by_name_kind;
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libbpf_find_vmlinux_btf_id;
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} LIBBPF_0.0.5;
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LIBBPF_0.0.7 {
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global:
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btf_dump__emit_type_decl;
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bpf_link__disconnect;
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bpf_map__attach_struct_ops;
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bpf_map_delete_batch;
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bpf_map_lookup_and_delete_batch;
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bpf_map_lookup_batch;
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bpf_map_update_batch;
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bpf_object__find_program_by_name;
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bpf_object__attach_skeleton;
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bpf_object__destroy_skeleton;
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bpf_object__detach_skeleton;
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bpf_object__load_skeleton;
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bpf_object__open_skeleton;
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bpf_probe_large_insn_limit;
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bpf_prog_attach_xattr;
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bpf_program__attach;
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bpf_program__name;
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bpf_program__is_extension;
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bpf_program__is_struct_ops;
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bpf_program__set_extension;
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bpf_program__set_struct_ops;
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btf__align_of;
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libbpf_find_kernel_btf;
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} LIBBPF_0.0.6;
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LIBBPF_0.0.8 {
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global:
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bpf_link__fd;
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bpf_link__open;
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bpf_link__pin;
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bpf_link__pin_path;
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bpf_link__unpin;
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bpf_link__update_program;
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bpf_link_create;
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bpf_link_update;
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bpf_map__set_initial_value;
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bpf_program__attach_cgroup;
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bpf_program__attach_lsm;
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bpf_program__is_lsm;
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bpf_program__set_attach_target;
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bpf_program__set_lsm;
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bpf_set_link_xdp_fd_opts;
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} LIBBPF_0.0.7;
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LIBBPF_0.0.9 {
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global:
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bpf_enable_stats;
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bpf_iter_create;
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bpf_link_get_fd_by_id;
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bpf_link_get_next_id;
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bpf_program__attach_iter;
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bpf_program__attach_netns;
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perf_buffer__consume;
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ring_buffer__add;
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ring_buffer__consume;
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ring_buffer__free;
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ring_buffer__new;
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ring_buffer__poll;
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} LIBBPF_0.0.8;
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LIBBPF_0.1.0 {
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global:
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bpf_link__detach;
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bpf_link_detach;
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bpf_map__ifindex;
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bpf_map__key_size;
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bpf_map__map_flags;
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bpf_map__max_entries;
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bpf_map__numa_node;
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bpf_map__set_key_size;
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bpf_map__set_map_flags;
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bpf_map__set_max_entries;
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bpf_map__set_numa_node;
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bpf_map__set_type;
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bpf_map__set_value_size;
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bpf_map__type;
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bpf_map__value_size;
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bpf_program__attach_xdp;
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bpf_program__autoload;
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bpf_program__is_sk_lookup;
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bpf_program__set_autoload;
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bpf_program__set_sk_lookup;
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btf__parse;
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btf__parse_raw;
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btf__pointer_size;
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btf__set_fd;
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btf__set_pointer_size;
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} LIBBPF_0.0.9;
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LIBBPF_0.2.0 {
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global:
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perf_buffer__buffer_cnt;
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perf_buffer__buffer_fd;
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perf_buffer__epoll_fd;
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perf_buffer__consume_buffer;
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} LIBBPF_0.1.0;
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